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          <span class="refentrytitle">vdelay3</span>
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        <p>vdelay3 — 
      A variable time delay with cubic interpolation.
    </p>
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      <div class="refsect1">
        <a id="idp163075344"></a>
        <h2>Description</h2>
        <p>
      <span class="emphasis"><em>vdelay3</em></span> is experimental. It is the same as <a class="link" href="vdelay.html" title="vdelay"><em class="citetitle">vdelay</em></a> except that it uses cubic interpolation. (New in Version 3.50.)
    </p>
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        <h2>Syntax</h2>
        <pre class="synopsis">ares <span class="command"><strong>vdelay3</strong></span> asig, adel, imaxdel [, iskip]</pre>
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      <div class="refsect1">
        <a id="idp163080000"></a>
        <h2>Initialization</h2>
        <p>
      <span class="emphasis"><em>imaxdel</em></span> -- Maximum value of delay in milliseconds. If <span class="emphasis"><em>adel</em></span> gains a value greater than <span class="emphasis"><em>imaxdel</em></span> it is folded around <span class="emphasis"><em>imaxdel</em></span>. This should not happen.
    </p>
        <p>
      <span class="emphasis"><em>iskip</em></span> (optional) -- Skip initialization if present and non-zero.
    </p>
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      <div class="refsect1">
        <a id="idp163083920"></a>
        <h2>Performance</h2>
        <p>
      With this unit generator it is possible to do Doppler effects or chorusing and flanging.
    </p>
        <p>
      <span class="emphasis"><em>asig</em></span> -- Input signal.
    </p>
        <p>
      <span class="emphasis"><em>adel</em></span> -- Current value of delay in milliseconds. Note that linear functions have no pitch change effects. Fast changing values of <span class="emphasis"><em>adel</em></span> will cause discontinuities in the waveform resulting noise.
    </p>
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        <a id="idp163087488"></a>
        <h2>Examples</h2>
        <p>
      Here is an example of the vdelay3 opcode. It uses the file <a class="ulink" href="examples/vdelay3.csd" target="_top"><em class="citetitle">vdelay3.csd</em></a>.
      </p>
        <div class="example">
          <a id="idp163089344"></a>
          <p class="title">
            <strong>Example 986. Example of the vdelay3 opcode.</strong>
          </p>
          <div class="example-contents">
            <p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
            <pre class="programlisting">
<span class="csdtag">&lt;CsoundSynthesizer&gt;</span>
<span class="csdtag">&lt;CsOptions&gt;</span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac  <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc    ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o vdelay3.wav -W ;;; for file output any platform</span>
<span class="csdtag">&lt;/CsOptions&gt;</span>
<span class="csdtag">&lt;CsInstruments&gt;</span>

<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span>  <span class="op">=</span> 1

<span class="oblock">instr</span> 1 

ims  <span class="op">=</span> 100			<span class="comment">;maximum delay time in msec</span>
aout <span class="opc">poscil</span> .8, 220, 1		<span class="comment">;make a signal</span>
a2   <span class="opc">poscil</span> ims<span class="op">/</span>2, 1<span class="op">/</span>p3, 1	<span class="comment">;make an LFO</span>
a2   <span class="op">=</span> a2 <span class="op">+</span> ims<span class="op">/</span>2		<span class="comment">;offset the LFO so that it is positive</span>
asig <span class="opc">vdelay3</span> aout, a2, ims	<span class="comment">;use the LFO to control delay time</span>
     <span class="opc">outs</span>  asig, asig

<span class="oblock">endin</span>

<span class="csdtag">&lt;/CsInstruments&gt;</span>
<span class="csdtag">&lt;CsScore&gt;</span>
<span class="stamnt">f</span>1 0 8192 10 1

<span class="stamnt">i</span> 1 0 5 

<span class="stamnt">e</span>

<span class="csdtag">&lt;/CsScore&gt;</span>
<span class="csdtag">&lt;/CsoundSynthesizer&gt;</span>
</pre>
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        <p><br class="example-break" />
       Two important points here. First, the delay time must be always positive. And second, even though the delay time can be controlled in k-rate, it is not advised to do so, since sudden time changes will create clicks.
    </p>
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      <div class="refsect1">
        <a id="idp163093872"></a>
        <h2>See Also</h2>
        <p>
      <a class="link" href="vdelay.html" title="vdelay"><em class="citetitle">vdelay</em></a>
    </p>
      </div>
      <div class="refsect1">
        <a id="idp163095920"></a>
        <h2>Credits</h2>
        <p>
      </p>
        <table border="0" summary="Simple list" class="simplelist">
          <tr>
            <td>Author: Paris Smaragdis</td>
          </tr>
          <tr>
            <td>MIT, Cambridge</td>
          </tr>
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            <td>1995</td>
          </tr>
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